1187011481 has 2 divisors, whose sum is σ = 1187011482. Its totient is φ = 1187011480.

The previous prime is 1187011411. The next prime is 1187011487. The reversal of 1187011481 is 1841107811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1086691225 + 100320256 = 32965^2 + 10016^2 .

It is an emirp because it is prime and its reverse (1841107811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1187011481 - 2¹⁰ = 1187010457 is a prime.

It is a super-2 number, since 2×1187011481² = 2817992512051626722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1187011487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593505740 + 593505741.

It is an arithmetic number, because the mean of its divisors is an integer number (593505741).

Almost surely, 2^1187011481 is an apocalyptic number.

It is an amenable number.

1187011481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187011481 is an equidigital number, since it uses as much as digits as its factorization.

1187011481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 32.

The square root of 1187011481 is about 34453.0329724395. The cubic root of 1187011481 is about 1058.8106634937.

The spelling of 1187011481 in words is "one billion, one hundred eighty-seven million, eleven thousand, four hundred eighty-one".